> Sure, but how does that make a DS2 record useful? It needs a resolver
> that understands more than NS and DS.  Why would you do that and
> not also do DELEG?

A few arguments to keep DS2 separate from DELEG:
- there are DNSSEC validators that are not recursing. For this reason it
  might be more clear to keep DNSSEC separate from delegation.
- An operator may not be interested in DELEG for delegation purposes
  but may want to use DS2. It would be extra operational complexity if
  the operator would be forced to add a DELEG record just to be able to use
  DS2.
- I assume we will get only one chance to introduce a range of parent
  types. We may want to err on the side of flexibility.

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